High Sec Labs Secure 4 Port KM Switches are hardware-based peripheral sharing devices that allow a single keyboard and mouse to control up to four computers, each connected to its own dedicated display(s). The devices are certified under NIAP Common Criteria Protection Profile 4.0 (PP4.0), providing hardware-enforced isolation between connected systems. Switching between computers is performed by moving the mouse cursor from one screen to the next, with no manual button presses required. Each connected computer maintains its own dedicated display connection, and the switch supports multi-monitor configurations of up to four displays per computer in extended or duplicate mode (requires driver installation on Windows). Select models (SM40NU-4 and SM80NU-4) include a dedicated Common Access Card (CAC) port, enabling a single CAC/smart card reader to authenticate across all connected computers. These models also include a sound output port, with the ability to freeze channel audio and/or the CAC independently when switching between input sources. The devices are compliant with both BAA (Buy American Act) and TAA (Trade Agreements Act), making them suitable for U.S. government and defense procurement. Target use cases include government agencies, defense operations, and organizational operation centers where strict peripheral security and system isolation are required.